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Preparation method and application of prussian blue complex/carbon composite material

A technology of carbon composite materials and Prussian blue, which is applied in the field of energy material preparation and electrochemistry, can solve the problems of high content of internal vacancies, crystal water and coordination water, poor contact, and restrictions on large-scale applications, and achieve suitable Large-scale production, excellent cycle stability, and the effect of low content of crystallization water and coordination water

Active Publication Date: 2013-12-11
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This type of method has the following disadvantages: 1) The crystal structure of the Prussian blue complex prepared by mixed precipitation is not perfect, and the internal vacancies, crystal water and coordination water content are relatively large, which makes it show poor performance when used as a cathode material for lithium / sodium ion batteries. Low capacity and poor cycle performance; 2) Prussian blue and carbon materials are not in situ recombination, resulting in poor contact between the two, and poor battery performance at high rates
Thus limiting the large-scale application of this type of material in lithium / sodium-ion batteries

Method used

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  • Preparation method and application of prussian blue complex/carbon composite material
  • Preparation method and application of prussian blue complex/carbon composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Embodiment 1, preparation Prussian blue complex compound / carbon composite material

[0027] Press Na 4 Fe(CN) 6 : HCl: Ketjen black = 1:0.1:5 mole fraction weighed, adding water as a solvent, heating at 60°C for 16h. After the reaction is completed, it is separated and dried to obtain the Prussian blue complex / carbon composite material provided by the present invention.

[0028] Use powder X-ray diffractometer (Rigaku DmaxrB, CuK ray) to analyze and confirm the crystal structure of the product, the results are as follows figure 1 As shown, it can be seen from the X-ray diffraction spectrum that there is no impurity peak, indicating that the product is of high purity. Since the obtained carbon has a non-crystalline structure, there is no diffraction peak.

[0029] The morphology of the product was analyzed with a scanning electron microscope (SEM, Japan Electron Scanning Electron Microscope JEOL-6701F), such as figure 2 As shown, the Prussian blue is in the form of ...

Embodiment 2

[0037] Embodiment 2, preparation Prussian blue complex compound / carbon composite material

[0038] press K 4 Fe(CN) 6 : HNO 3 : Weigh the mole fraction of carbon nanotubes=1:0.1:0.1, add water as a solvent, and heat at room temperature for 24 hours. After the reaction is completed, it is separated and dried to obtain the Prussian blue complex / carbon composite material provided by the present invention. The composition of the obtained Prussian blue complex / carbon and the test results in the simulated battery are listed in Table 1, and the molecular formula and corresponding defects and water content are listed in Table 2.

Embodiment 3

[0045] Embodiment 3, preparation Prussian blue complex compound / carbon composite material

[0046] Press Na 3 Co(CN) 6 :H 2 SO 4 : Weigh the mole fraction of carbon black=1:0.5:5, add water as a solvent, and heat at 40°C for 18h. After the reaction is completed, it is separated and dried to obtain the Prussian blue complex / carbon composite material provided by the present invention. The composition of the obtained Prussian blue complex / carbon and the test results in the simulated battery are listed in Table 1, and the molecular formula and corresponding defects and water content are listed in Table 2.

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Abstract

The invention discloses a preparation method of a prussian blue complex / carbon composite material and an application of the composite material as a positive electrode material for lithium ion and sodium ion batteries. The preparation method of the prussian blue complex / carbon composite material comprises at least the steps of uniformly dispersing a transition metal cyano complex, an inorganic acid and a carbon material in water to obtain a reaction solution; and heating the solution for a certain time to obtain the prussian blue complex / carbon composite material. The method is simple in preparation, can be controlled easily and has high practical degree. Crystal water content and coordinated water content in the obtained prussian blue complex / carbon composite material are little, so that the prussian blue complex / carbon composite material presents high capacity and excellent cycle performance when being used as the positive electrode material for the lithium ion and sodium ion batteries.

Description

technical field [0001] The invention belongs to the field of energy material preparation and electrochemistry, and in particular relates to a preparation method of a positive electrode material (Prussian blue complex / carbon composite material) for lithium ion and sodium ion batteries. Background technique [0002] The high specific capacity, high energy density and power density, no self-discharge, and green environmental protection exhibited by lithium-ion batteries make it a hot spot in current research and development. The working principle of sodium-ion batteries is similar, and it can also store and release energy, and the content of sodium in the earth's crust is 2.3-2.8%, which is about 12,500 times that of lithium, making sodium-ion batteries cheaper and more reliable. characteristics of sustainable development. For these two types of batteries, the capacity of positive electrode materials currently reported is much lower than that of negative electrodes, so the imp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1393H01M4/58
CPCY02E60/10
Inventor 郭玉国吴兴隆尤雅万立骏
Owner INST OF CHEM CHINESE ACAD OF SCI
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